There experiment was made _____a rainy morninga,in b.on c.at d.by 请选择

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Thereexperimentwasmade_____arainymorninga,inb.onc.atd.by请选择Thereexperimentwasmade_____arainymorninga

There experiment was made _____a rainy morninga,in b.on c.at d.by 请选择
There experiment was made _____a rainy morning
a,in b.on c.at d.by
请选择

There experiment was made _____a rainy morninga,in b.on c.at d.by 请选择
选b
morning/afternoon/evening前若有定语修饰时,介词一律用on
如:on a cold morning
on a windy afternoon
on Monday evening
---绝对正确!

选b
morning,afternoon,evening前面只要有修饰词,介词就要用on,不能用in。

选 B
一般在早上用 in the morning,但是这里有修饰词rainy,说明是具体的某一天,这时用on,不用in
在一个下雨的早上做的实验